Roof structure

Abstract

To provide a roof frame capable of reducing the number of members.SOLUTION: A roof frame 14 is provided on a stand 12, and comprises an annular outer ring body 32 provided on the outer peripheral side of a roof 16 formed in an annular shape, an annular inner ring body 38 provided on the inner peripheral side of the roof 16 inside the outer ring body 32, a plurality of first cantilever beams 34 which projects inward from the outer ring body 32 and supports a load of the inner ring body 38 and the roof 16, and a plurality of first small beams 48 joined diagonally across the first cantilever beams 34 and formed into a curved shape in plan view. The first small beam 48 is joined to the joint part of one first cantilever beam 34 and the inner ring body 38 and the joint part of the other first cantilever 34 and the outer ring body 32, so that a horizontal truss is formed by one first cantilever 34, the outer ring body 32 and the first small beam 48 and the first small beam 48 doubles as a member for supporting the load of the roof 16 and as a member forming a part of the horizontal truss.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a roof structure for supporting a roof. [Background technology]

[0002] 2. Description of the Related Art A roof structure has been proposed in which a roof having an opening in the center is supported by truss beams or the like (see, for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-12796 A [Patent Document 2] Japanese Patent Application Publication No. 6-313337 [Patent Document 3] Japanese Patent Application Publication No. 7-119209 Summary of the Invention [Problem to be solved by the invention]

[0004] However, these roof structures require a large number of members to support the roof, and there is room for improvement.

[0005] In consideration of the above, an object of the present invention is to provide a roof structure that makes it possible to reduce the number of components. [Means for solving the problem]

[0006] The roof structure described in claim 1 is provided on an external structure and comprises an annular outer ring body provided on the outer periphery of a ring-shaped roof, an annular inner ring body provided inside the outer ring body and on the inner periphery of the roof, a plurality of cantilever beams that extend inward from the outer ring body and support the load of the inner ring body and the roof, and a plurality of small beams that are joined to the cantilever beams and intersect diagonally and are formed into a curved shape in a planar view, with the small beams joined to the joint between one of the cantilever beams and the inner ring body and to the joint between the other cantilever beam and the outer ring body, so that a horizontal truss is formed by the one cantilever beam, the outer ring body, and the small beams, and the small beams serve both as a member that supports the load of the roof and as a member that constitutes part of the horizontal truss.

[0007] In the roof structure described in claim 1, the inner ring body is supported by a cantilever beam that projects inward from the outer ring body, and a small beam formed in a curved shape in plan view is joined to cross the cantilever beam at an angle. A horizontal truss is formed by joining a small beam formed in a curved shape in plan view to a joint between one cantilever beam and the inner ring body and a joint between the other cantilever beam and the outer ring body, and the small beam serves both as a member that supports the roof load and as a member that constitutes part of the horizontal truss, so that a roof structure with high planar rigidity can be realized with a small number of members.

[0008] The invention described in claim 2 is the roof structure described in claim 1, in which the plurality of small beams are inclined in the same direction.

[0009] In the roof structure described in claim 2, when viewed from below, the small beams of the roof structure appear to be swirling, providing a novel feeling.

[0010] The invention described in claim 3 is a roof structure described in claim 1 or claim 2, which includes a pillar that is provided on the external structure and is taller than the cantilever beam, and a lifting member having one end connected to the pillar and the other end connected to the longitudinal middle portion of the cantilever beam for lifting the cantilever beam.

[0011] For example, if a cantilever beam is used as a vertical truss beam and the roof is attached from above to the lower chord so that the web of the vertical truss beam and the upper chord are not visible, it will be necessary to penetrate many webs into the roof, resulting in many points that require weatherproofing.

[0012] On the other hand, if the cantilever beam is lifted by a lifting member, fewer mounting holes need to be drilled in the roof when attaching the roof to the roof structure from above than if the cantilever beam was a vertical truss beam, so the number of areas that need to be waterproofed can be reduced. Effect of the Invention

[0013] As described above, according to the roof structure of the present invention, it is possible to reduce the number of components. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view showing a building equipped with a roof structure. [Diagram 2] FIG. 1 is a cross-sectional view showing a building equipped with a roof structure. [Diagram 3] FIG. [Figure 4] FIG. 4 is a plan view showing a joint portion between a first cantilever beam and a small beam. [Diagram 5] FIG. 11 is a plan view showing a roof structure according to another embodiment. [Figure 6] FIG. 11 is a plan view showing yet another roof structure. [Figure 7] FIG. 13 is a plan view showing yet another roof structure. [Figure 8] FIG. 11 is a plan view showing yet another roof structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] A roof structure 14 according to one embodiment of the present invention will be described with reference to Figs. 1 to 4. 1 and 2 is mainly composed of a stand 12 as an external structure, and a roof structure 14. The roof structure 14 is formed in a generally elliptical shape with its major axis extending in the X direction of the drawing and its minor axis extending in the Y direction in a plan view, and supports a ring-shaped roof 16 also formed in a generally elliptical shape.

[0016] The stands 12 in this embodiment are made of reinforced concrete, for example, and are installed so as to surround the stadium 18.

[0017] The stand 12 is mainly composed of pillars 20, beams 22, and inclined portions 24. The pillars 20 are erected on a foundation 26 and extend in the vertical direction, and the beams 22 are bridged between the pillars 20.

[0018] The inclined portions 24 are formed so as to incline downward from the outer periphery side to the inner periphery side, and in this embodiment, the inclined portions 24 are provided at the upper and lower parts of the stand 12. Seats 28 are installed on the inclined portions 24.

[0019] (roof frame) A number of roof pillars 30 are erected at intervals around the periphery of the upper stand 12, and a support pillar 42 is erected at the upper end of each roof pillar 30. An outer ring body 32 made of steel (H-beam, for example) and formed into a substantially elliptical shape in plan view is provided so as to connect the lower parts of the pillars 42 together.

[0020] One end of a first cantilever beam 34 that protrudes toward the stadium 18 is connected to the lower side of the support pillar 42. The first cantilever beam 34 extends perpendicular to the tangent direction of the outer ring body 32 in a plan view. In other words, the first cantilever beam 34 extends along the radial direction of the ellipse. Moreover, the first cantilever beam 34 is inclined upward toward the stadium 18 in a side view.

[0021] One end of a second cantilever beam 36 extending in the opposite direction to the arena 18 is connected to the lower side of the support pillar 42. The second cantilever beam 36 is shorter than the first cantilever beam 34, and extends perpendicular to the tangent direction of the outer ring body 32 in a plan view. The second cantilever beam 36 is inclined upward in the opposite direction to the arena 18 in a side view.

[0022] An inner ring body 38 made of steel (round steel, for example) and formed into a substantially elliptical shape in a plan view is provided on the inner peripheral side of the outer ring body 32 so as to connect the inner peripheral side ends of the first cantilever beams 34. The inner ring body 38 is supported by the multiple first cantilever beams 34.

[0023] An outermost ring body 40 made of steel (round steel as an example) and formed into an approximately elliptical shape when viewed in a plane is provided on the outer periphery of the outer ring body 32 to connect the outer periphery ends of the second cantilever beams 36.

[0024] One end of a first hoisting member 44 made of steel (for example, a square steel pipe) is connected to the upper end of the support 42. The other end of the first hoisting member 44 is connected to the middle part of the first cantilever beam 34 in the longitudinal direction.

[0025] One end of a second hoisting member 46 made of steel (a square steel pipe, as an example) is connected to the upper end of the support 42. The other end of the second hoisting member 46 is connected to the tip of the second cantilever beam 36. The tip of the second cantilever beam 36 is connected to the column portion 20 via support members 47A and 47B.

[0026] As shown in Figures 1 and 3, the roof structure 14 is diagonally joined to the first cantilever beam 34 and has a plurality of first small beams 48 that, when viewed in a plan view, extend in a curved shape from the outer ring body 32 to the inner ring body 38.

[0027] 3, when the roof frame 14 is viewed from above, the first small beams 48 connected in a curved shape have one longitudinal end connected to the joint between one first cantilever beam 34 and the outer ring body 32, the other longitudinal end connected to the joint between the other first cantilever beam 34 and the inner ring body 38, and an intermediate portion in the longitudinal direction obliquely intersect with the first cantilever beams 34 located between the one first cantilever beam 34 and the other first cantilever beam 34. Furthermore, the first small beams 48 connected in a curved shape are inclined so that one end on the outer periphery side is located in the clockwise direction (arrow CW direction) with respect to the other end on the inner periphery side, and are curved so that the counterclockwise direction side (arrow CCW direction side) is convex in plan view.

[0028] As shown in FIG. 1, the roof frame 14 includes a plurality of second small beams 62 between the outer ring body 32 and the outermost ring body 40, which cross the second cantilever beam 36 at an angle and are connected in a curved shape in a plan view. The plurality of second small beams 62 connected in this manner are provided on an extension line of the first small beam 48 in a plan view, with one end in the longitudinal direction connected to the upper end of the support 42 and the other end in the longitudinal direction connected to the connection part between the second cantilever beam 36 and the outermost ring body 40. The second cantilever beam 36 and the second small beams 62 support the outer periphery of the roof 16. Note that the second small beams 62 are not shown in FIG. 3.

[0029] In the roof frame 14 of this embodiment, a first small beam 48 is joined to the joint between one first cantilever beam 34 and the inner ring body 38 and to the joint between the other first cantilever beam 34 and the outer ring body 32, so that a horizontal truss is formed by the one first cantilever beam 34, the outer ring body 32, the first small beam 48, and the inner ring body 38, and the roof 16 is supported by this horizontal truss. Therefore, the first small beam 48 serves both as a member that supports the load of the roof 16 and as a member that constitutes part of the horizontal truss.

[0030] As in this embodiment, by inclining the first small beams 48 with respect to the first cantilever beams 34 and connecting them in a curved shape, it is possible to set the size and shape of the rectangular (approximately parallelogram) frame formed by the two first cantilever beams 34 and the two first small beams 48 to be approximately the same. In addition, one first small beam 48 and the other first small beam 48 adjacent to each other are approximately parallel to each other.

[0031] The roof 16, which has an annular elliptical shape in a plan view, is placed on the top of the first cantilever beam 34, the first small beam 48, the second cantilever beam 36, and the second small beam 62. The roof 16 is fixed to the first cantilever beam 34, the first small beam 48, the second cantilever beam 36, and the second small beam 62 using mounting members (not shown). The roof 16 in this embodiment is formed of a membrane-like member as an example, but may be formed of a plate-like member.

[0032] The other end of the first hoisting member 44 is connected to the longitudinal middle part of the first cantilever beam 34, and the connection part between the first hoisting member 44 and the first cantilever beam 34 passes through a hole (mounting hole) (not shown) formed in the roof 16, but is weather-proofed and waterproofed to prevent rainwater from leaking from the hole. The support pillar 42 also passes through a hole (not shown) formed in the roof 16, but is weather-proofed and waterproofed to prevent rainwater from leaking from the hole.

[0033] FIG. 4 shows an example of a joint between the first cantilever beam 34 and the first sub-beam 48. As shown in FIG. The first sub-beam 48 in this embodiment is formed of a round steel pipe 50, and a connection part 52 is welded to the end of the round steel pipe 50. On the other hand, a steel plate 54 is welded obliquely to the web 34A of the first cantilever beam 34 made of H-shaped steel. The round steel pipe 50 in this embodiment has a straight shape, but by slightly changing the inclination angle (when viewed in a plan view) of each of the multiple connected first small beams 48 for each beam, as shown in Fig. 3, the multiple connected first small beams 48 as a whole appear to be curved (to be precise, pseudo-curved). Note that the round steel pipe 50 may be curved.

[0034] The connection portion 52 of the first sub-beam 48 and the steel plate 54 of the first cantilever beam 34 are butted against each other, and the connection portion 52 and the steel plate 54 are sandwiched between two steel plates 56 and fixed using a bolt 58 and a nut 60. The first cantilever beam 34 and the first sub-beam 48 may be joined by other methods. Although not shown in the drawings, the second cantilever beam 36 and the second sub-beam 62 are also joined in the same manner as the first cantilever beam 34 and the first sub-beam 48.

[0035] (Action, effect) As shown in Figure 1, in the roof structure 14 of this embodiment, an inner ring body 38 is supported by a first cantilever beam 34 that extends inward from an outer ring body 32 provided at the upper end of the roof column 30, and a first small beam 48 that is connected in a curved shape when viewed in a plane intersects diagonally with the first cantilever beam 34.

[0036] A horizontal truss is formed by joining first small beams 48, which are connected in a curved shape when viewed in a plane, to the joint between one first cantilever beam 34 and the inner ring body 38 and the joint between the other first cantilever beam 34 and the outer ring body 32.Since the first small beams 48 serve both as a member that supports the load of the roof 16 and as a member that forms part of the horizontal truss, a roof structure 14 with high planar rigidity can be realized using a small number of members.

[0037] In the roof structure 14 of this embodiment, when looking up from the seats 28, what is visible on the underside of the roof 16 is the first cantilever beam 34 made of H-shaped steel and the first small beam 48 made of round steel pipe, so that compared to when the roof 16 is supported using vertical truss materials, the appearance is simpler and a clean impression is given to the spectators.

[0038] Furthermore, in the roof structure 14 of this embodiment, the first small beams 48, which are connected in a curved shape, are inclined in the same direction when viewed in a plan view, so that when viewed from the seats 28, the first small beams 48 appear to be swirling, providing the audience with a novel sensation.

[0039] However, if the first cantilever beam 34 in this embodiment were a truss beam and a membrane roof 16 were attached from above to the lower chord so that the web of the truss beam and the upper chord were not visible, it would be necessary to penetrate many webs of the truss beam into the roof, resulting in more points that require weatherproofing. On the other hand, if the roof structure 14 of this embodiment is configured to lift one point in the middle of the longitudinal direction of the first cantilever beam 34 with the first lifting member 44, fewer mounting holes need to be drilled in the roof 16 when attaching the roof 16 from above, compared to when the first cantilever beam 34 is made into a truss structure, and the number of points that need to be waterproofed or waterproofed can be reduced.

[0040] [Other embodiments] Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms without departing from the spirit and scope of the present invention.

[0041] In the roof structure 14 of the above embodiment, as shown in FIG. 3, all of the first small beams 48 are inclined in the same direction, but the present invention is not limited to this. For example, as shown in FIGS. 5 to 8, the inclination direction of the first small beams 48 may be different for each portion.

[0042] In the roof structure 14 shown in Figure 5, a first region 14A including a first small beam 48 inclined so that its inner side is positioned in a counterclockwise direction (arrow CCW direction) relative to the outer periphery, and a second region 14B including a first small beam 48 inclined so that its inner side is positioned in a clockwise direction (arrow CW direction) relative to the outer periphery are arranged adjacent to each other with a third region 14C in between which is provided with first small beams 48 extending circumferentially.

[0043] The roof structure 14 shown in FIG. 6 is a modified example of the roof structure 14 shown in FIG. 5, and a third region 14C on the Y direction side is formed to be wider toward the outer periphery.

[0044] The roof structure 14 shown in FIG. 7 is a modified example of the roof structure 14 shown in FIG. 4, and a third region 14C on the X-direction side is formed to be wider toward the inner periphery.

[0045] The roof structure 14 shown in FIG. 8 is a modified example of the roof structure 14 shown in FIG. 4, in which the first regions 14A and the second regions 14B are arranged alternately in the circumferential direction.

[0046] In the roof structure 14 of Figs. 5 to 8 as well, it is possible to realize a roof structure 14 with high planar rigidity using a small number of members, and it is possible to achieve a simple appearance.

[0047] Although the roof structure 14 in the above embodiment has an elliptical shape in a plan view, the shape of the roof structure 14 in a plan view may be other than an ellipse, such as a circle or a polygon. [Explanation of symbols]

[0048] 10. Building 12 Stand (external structure) 14 Roof frame 16 Roof 32 Outer ring body 34 1st cantilever beam (cantilever beam) 38 Inner ring body 42 Post 44 1st lifting member (lifting member) 48 1st small beam (small beam)

Claims

1. An annular outer ring body provided on the outer structure; an annular inner ring body provided inside the outer ring body; a plurality of cantilevers extending inwardly from the outer ring body and supporting the inner ring body; A plurality of small beams that are joined to the cantilever beam at an angle and are formed into a curved shape in a plan view; a roof supported by the outer ring body, the inner ring body, the cantilever beams, and the small beams; having The small beam is joined to a joint between one of the cantilever beams and the inner ring body and a joint between the other cantilever beam and the outer ring body, so that a horizontal truss is formed by the one cantilever beam, the outer ring body, and the small beam. roof frame.

2. The roof is made of a membrane or sheet material. The roof structure according to claim 1.

3. The plurality of small beams are inclined in the same direction. The roof structure according to claim 1.

4. A support pillar provided on the external structure and having a height greater than that of the cantilever beam; a lifting member having one end connected to the support and the other end connected to a longitudinal intermediate portion of the cantilever beam for lifting the cantilever beam; The roof structure according to any one of claims 1 to 3, comprising:

Images